This auction is for a Volcanic Plate Shield with a Unique Variant of Increased Elemental Defense: High.

Item listing on the wiki: http://wiki.spiralknights.com/Volcanic_Plate_Shield
Item screenshot: http://subterfuge.org/misc/shield_auction.jpg

Bidding will end Friday, May 13th (OooOOoOOOOOooo...) at 8:30pm game time, with close time of five minutes after the last bid
Starting bid at 4,000ce
Bid increments of 250ce
Buyout at 12,000ce

(Note that the item is currently a bound Heavy Plate Shield at heat level 10 - I have all the necessary materials and the recipe to craft it into the item being auctioned right now. If the winner would like another shield in the tree crafted instead, that will be fine, though pre-payment will be required due to the relative lack of popularity of the other shields in comparison to the Volcanic.)